IOTA/IOTA-ES occultation update for (1520) Imatra / UCAC4 361-088545 event on 2024 Jul 01, 23:46 UT Visible from Summary ------- On 2024 Jul 01 UT, the 55.8758175332543 km diameter asteroid (1520) Imatra will occult a 11.7 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.48 mag to 15.15 mag (the magnitude of the asteroid) for at most 4.540 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 97 * date and approx. time of event: 2024 Jul 01, 23:38 - 2024 Jul 01, 23:54 * geocentric midpoint of event [JD]: 2460493.49052154 * magnitude of target star: 11.71 * magnitude drop [mag]: 3.48 * estimated maximum duration [s]: 4.540 * Moon: 17 % sunlit, 150° distance * Sun: 159° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 61 * 1 sigma uncertainty interval [path widths]: +/- 0.38 * 1 sigma uncertainty interval [seconds]: +/- 2.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.023, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.024", 0.004", 78°) * approx speed of asteroid's shadow [km/s]: 12.3358 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 361-088545 by 1520 Imatra on 2024 Jul 1 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude -110 0 0 - 2 47 43 23 54 14.9 0 108 19 - 2 30 22 - 3 5 6 - 2 17 12 - 3 18 21 .... -109 0 0 - 3 7 39 23 54 14.8 1 108 18 - 2 50 15 - 3 25 4 - 2 37 3 - 3 38 21 0.34 -108 0 0 - 3 28 1 23 54 14.5 2 108 17 - 3 10 36 - 3 45 29 - 2 57 22 - 3 58 48 0.38 -107 0 0 - 3 48 51 23 54 14.0 3 108 16 - 3 31 23 - 4 6 21 - 3 18 7 - 4 19 41 0.39 -106 0 0 - 4 10 6 23 54 13.3 4 108 15 - 3 52 36 - 4 27 39 - 3 39 19 - 4 41 1 0.40 -105 0 0 - 4 31 48 23 54 12.4 5 108 14 - 4 14 15 - 4 49 23 - 4 0 56 - 5 2 47 0.40 -104 0 0 - 4 53 55 23 54 11.3 6 108 13 - 4 36 20 - 5 11 33 - 4 23 0 - 5 24 59 0.41 -103 0 0 - 5 16 28 23 54 10.0 8 108 12 - 4 58 50 - 5 34 8 - 4 45 28 - 5 47 35 0.41 -102 0 0 - 5 39 25 23 54 8.6 9 107 11 - 5 21 45 - 5 57 7 - 5 8 21 - 6 10 37 0.41 -101 0 0 - 6 2 46 23 54 6.9 10 107 10 - 5 45 4 - 6 20 31 - 5 31 38 - 6 34 3 0.41 -100 0 0 - 6 26 32 23 54 5.0 11 107 9 - 6 8 47 - 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0.46 82 0 0 -44 45 29 23 38 32.9 7 252 -26 -44 27 50 -45 3 10 -44 14 27 -45 16 38 0.47 83 0 0 -44 28 43 23 38 32.0 7 251 -25 -44 11 2 -44 46 26 -43 57 36 -44 59 57 0.47 84 0 0 -44 11 33 23 38 31.1 6 251 -24 -43 53 49 -44 29 19 -43 40 22 -44 42 52 0.48 85 0 0 -43 53 59 23 38 30.4 5 250 -24 -43 36 12 -44 11 48 -43 22 43 -44 25 22 0.48 86 0 0 -43 36 0 23 38 29.7 4 249 -23 -43 18 11 -43 53 52 -43 4 40 -44 7 29 0.49 87 0 0 -43 17 38 23 38 29.2 4 249 -22 -42 59 46 -43 35 32 -42 46 13 -43 49 11 0.51 88 0 0 -42 58 51 23 38 28.7 3 248 -21 -42 40 56 -43 16 48 -42 27 21 -43 30 29 0.54 89 0 0 -42 39 39 23 38 28.4 2 247 -21 -42 21 42 -42 57 39 -42 8 5 -43 11 22 0.58 90 0 0 -42 20 3 23 38 28.2 1 247 -20 -42 2 3 -42 38 6 -41 48 24 -42 51 51 0.69 91 0 0 -42 0 3 23 38 28.0 0 246 -19 -41 42 0 -42 18 8 -41 28 19 -42 31 55 1.25 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 361-088545 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 17 47.0448 DE: -17 58 04.758 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 17 47.0448 DE: -17 58 04.758 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1520) Imatra asteroid class: approx. diameter [km]: 56 approx. diameter ["]: 0.035 distance from Earth [AU]: 2.19480 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#64 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.024", 0.004", 78.081° remarks: * orbital elements for (1520)Imatra : Mean anomaly = 264.7035616057 deg Arg. of pericenter = 119.4784608373 deg Long. of node = 253.2704877749 deg Inclination = 15.2758332940 deg Eccentricity = 0.0948056286 Semimajor axis = 3.1108186787 AU Perihelion dist = 2.8158955586 AU Mag: H = 10.44, G = 0.15 Epoch of elements : MJD 60492.99052159 TDT (2024 Jul 01.9905) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#642023Apr24,4.54,2024,7,1,23.772517,-0.141500,-0.374118,-6.512627,2.462602,0.001903,-0.000611,0.000001,0.000000 -17.2958,-17.9950,-175.56,23.01,False UCAC4 361-088545,17.29640133,-17.9679883,12.78,11.71,11.13,0.1,0,,17.32053182,-17.9949865,3.48,3.61,0,0,0 1520,Imatra,15.15,56.035,2.1948,0,0,-1.828,9.87,,2.8,0 0,264.5256,2024,7,1,119.4785,253.2705,15.2758,0.09481,3.11082,2.81590,10.44,5.0,0.15 1.380,0.0240,0.0040,78,0.0134,Known errors,1.15,0,-1,-1 20240701_088545,60140.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org